<template>
  <view class="next-tree">
    <view class="next-tree-mask" :class="{ 'show': showTree }" @tap="_cancel"></view>
    <view class="next-tree-cnt" :class="{ 'show': showTree }">
      <view class="next-tree-bar">
        <view class="next-tree-bar-cancel" :style="{ 'color': cancelColor }" hover-class="hover-c" @tap="_cancel">取消
        </view>
        <view class="next-tree-bar-title" :style="{ 'color': titleColor }">{{ title }}</view>
        <view class="next-tree-bar-confirm" :style="{ 'color': confirmColor }" hover-class="hover-c" @tap="_confirm">确定
        </view>
      </view>
      <view class="next-tree-view">
        <scroll-view class="next-tree-view-sc" :scroll-y="true">
          <block v-for="(item, index) in treeList" :key="index">
            <view class="next-tree-item" :style="[{
      paddingLeft: item.rank * 15 + 'px',
      zIndex: item.rank * -1 + 50
    }]" :class="{
      border: border === true,
      show: item.show,
      last: item.lastRank,
      showchild: item.showChild,
      open: item.open,
    }">
              <view class="next-tree-label" @tap.stop="_treeItemTap(item, index)">
                <image class="next-tree-icon"
                  :src="item.lastRank ? lastIcon : item.showChild ? currentIcon : defaultIcon"></image>
                {{ item.name }}
              </view>
              <view class="next-tree-check" @tap.stop="_treeItemSelect(item, index)"
                v-if="selectParent ? true : item.lastRank">
                <view class="next-tree-check-yes" v-if="item.checked" :class="{ 'radio': !multiple }"
                  :style="{ 'border-color': confirmColor, 'background-color': confirmColor }">
                  <view class="next-tree-check-yes-b" :style="{ 'background-color': confirmColor }">
                    <text class="icon-text">✔</text>
                  </view>
                </view>
                <view class="next-tree-check-no" v-else :class="{ 'radio': !multiple }"
                  :style="{ 'border-color': confirmColor }"></view>
              </view>
            </view>
          </block>
        </scroll-view>
      </view>
    </view>
  </view>
</template>

<script>
export default {
  name: "next-tree",
  props: {
    treeData: {
      type: Array,
      default: function () {
        return []
      }
    },
    valueKey: {
      type: String,
      default: 'id'
    },
    labelKey: {
      type: String,
      default: 'label'
    },
    childrenKey: {
      type: String,
      default: 'children'
    },
    title: {
      type: String,
      default: ''
    },
    multiple: { // 是否可以多选
      type: Boolean,
      default: false
      // default: true
    },
    selectParent: { //是否可以选父级
      type: Boolean,
      default: false
    },
    foldAll: { //折叠时关闭所有已经打开的子集，再次打开时需要一级一级打开
      type: Boolean,
      default: false
    },
    confirmColor: { // 确定按钮颜色
      type: String,
      default: '#2681FF' // #f9ae3d
    },
    cancelColor: { // 取消按钮颜色
      type: String,
      default: '' // #757575
    },
    titleColor: { // 标题颜色
      type: String,
      default: '' // #757575
    },
    currentIcon: { // 展开时候的ic
      type: String,
      default: ''
    },
    defaultIcon: { // 折叠时候的ic
      type: String,
      default: ''
    },
    lastIcon: { // 没有子集的ic
      type: String,
      default: ''
    },
    border: { // 是否有分割线
      type: Boolean,
      default: false
    },
  },
  data() {
    return {
      showTree: false,
      treeList: [],
      selectIndex: -1,
      childNums: [],
      rt: [],
      rtName: []
    }
  },
  computed: {},
  methods: {
    _show() {
      this.showTree = true
    },
    _hide() {
      this.showTree = false
    },
    _cancel() {
      this._hide()
      this.$emit("cancel", '');
    },
    _confirm() {
      this.rt = [];
      this.rtName = [];
      // 处理所选数据
      this.treeList.forEach((item, i) => {
        // if (item.checked && item.id == 100) {
        //   return this.confirmEach(this.treeData)
        // }
        if (item.checked && item.parentId) {
          this.rt.push(item.id)
          this.rtName.push(item.name)
        }
      })
      this._hide()
      this.$emit("confirm", { id: this.rt, name: this.rtName });
    },
    confirmEach(list) {
      list.forEach((item, index) => {
        if (item.isDy) {
          this.rtName.push(item.name)
          this.rt.push(item.id)
        }
        if (item.children && item.children.length > 0) this.confirmEach(item.children)
      })
    },
    //扁平化树结构
    _renderTreeList(list = [], rank = 0, parentId = [], parents = []) {
      list.forEach(item => {
        this.treeList.push({
          id: item[this.valueKey],
          name: item[this.labelKey],
          source: item,
          parentId, // 父级id数组
          parents, // 父级id数组
          rank, // 层级
          showChild: false, //子级是否显示
          open: false, //是否打开
          show: rank === 0, // 自身是否显示
          hideArr: [],
          orChecked: item.checked ? item.checked : false,
          checked: item.checked ? item.checked : false,
        })
        if (Array.isArray(item[this.childrenKey]) && item[this.childrenKey].length > 0) {
          // console.log(item)
          let parentid = [...parentId],
            parentArr = [...parents],
            childrenid = [];
          delete parentArr.children
          parentid.push(item[this.valueKey]);
          parentArr.push({
            [this.valueKey]: item[this.valueKey],
            [this.labelKey]: item[this.labelKey]
          })
          this._renderTreeList(item[this.childrenKey], rank + 1, parentid, parentArr);
        } else {
          this.treeList[this.treeList.length - 1].lastRank = true;
        }
      })
    },
    // 处理默认选择
    _defaultSelect() {
      this.treeList.forEach((v, i) => {
        if (v.checked) {
          this.treeList.forEach((v2, i2) => {
            if (v.parentId.toString().indexOf(v2.parentId.toString()) >= 0) {
              v2.show = true
              if (v.parentId.includes(v2.id)) {
                v2.showChild = true;
                v2.open = true;
              }
            }
          })
        }
      })
    },
    // 点击
    _treeItemTap(item, index) {
      if (item.lastRank === true) {
        //点击最后一级时触发事件
        this.treeList[index].checked = !this.treeList[index].checked
        this._fixMultiple(index)
        return;
      }
      let list = this.treeList;
      let id = item.id;
      item.showChild = !item.showChild;
      item.open = item.showChild ? true : !item.open;
      list.forEach((childItem, i) => {
        if (item.showChild === false) {
          //隐藏所有子级
          if (!childItem.parentId.includes(id)) {
            return;
          }
          if (!this.foldAll) {
            if (childItem.lastRank !== true && !childItem.open) {
              childItem.showChild = false;
            }
            // 为隐藏的内容添加一个标记
            if (childItem.show) {
              childItem.hideArr[item.rank] = id
            }
          } else {
            if (childItem.lastRank !== true) {
              childItem.showChild = false;
            }
          }
          childItem.show = false;
        } else {
          // 打开子集
          if (childItem.parentId[childItem.parentId.length - 1] === id) {
            childItem.show = true;
          }
          // 打开被隐藏的子集
          if (childItem.parentId.includes(id) && !this.foldAll) {
            // console.log(childItem.hideArr)
            if (childItem.hideArr[item.rank] === id) {
              childItem.show = true;
              if (childItem.open && childItem.showChild) {
                childItem.showChild = true
              } else {
                childItem.showChild = false
              }
              childItem.hideArr[item.rank] = null
            }
          }
        }
      })
    },
    _treeItemSelect(item, index) {
      this.treeList[index].checked = !this.treeList[index].checked
      // 选父级, 子级自动全选
      this.syncChecked(this.treeList, item.id, this.treeList[index].checked)
      if (item.rank > 0) {
        item.parentId.forEach((pid, indexP) => {
          const parent = this.treeList.filter(i => i.id === pid)
          const childNum = parent.length > 0 ? parent[0].childNum : 0
          if (this.childNums[pid] === undefined) {
            this.childNums[pid] = 1
          } else if (this.childNums[pid] < childNum) {
            this.childNums[pid]++
          }
        })
        //子级选择/选满/取消选择, 父级往上同步状态
        this.setAncestors(item.parentId, this.treeList[index].checked)
      }
      this._fixMultiple(index)
    },
    syncChecked(trees, pid, checked) {
      trees.forEach((item, index) => {
        if (item.parentId.includes(pid)) {
          this.treeList[index].checked = checked
          this.syncChecked(trees, item.id, checked)
        } else if (item.children !== undefined) {
          this.syncChecked(item.children, pid, checked)
        }
      })
    },
    setAncestors(pids, checked) {
      this.treeList.forEach((item, index) => {
        if (pids.includes(item.id)) {
          if (checked && this.childNums[item.id] !== undefined && item.childNum === this.childNums[item.id]) {
            // 子级全部选中, 父级才选中
            this.treeList[index].checked = true
          } else {
            this.treeList[index].checked = false
          }
          this.setAncestors(item.parentId, checked)
        }
      })
    },
    // _treeItemSelect(item, index) {
    // 	this.treeList[index].checked = !this.treeList[index].checked
    // 	this._fixMultiple(index)
    // },
    // 处理单选多选
    _fixMultiple(index) {
      if (!this.multiple) {
        // 如果是单选
        this.treeList.forEach((v, i) => {
          if (i != index) {
            this.treeList[i].checked = false
          } else {
            this.treeList[i].checked = true
          }
        })
      }
    },
    // 重置数据
    _reTreeList() {
      this.treeList.forEach((v, i) => {
        this.treeList[i].checked = v.orChecked
      })
    },
    _initTree(treeData = this.treeData) {
      this.treeList = [];
      this._renderTreeList(treeData);
      this.$nextTick(() => {
        this._defaultSelect(treeData)
      })
    }
  },
  mounted() {
    console.log('----------next-tree组件完成挂载demo------------')
    this._initTree();
    this.$watch(() => this.treeData, (list) => {
      this._initTree(list);
    }, { deep: true, immediate: true })
    this.$watch(() => [this.multiple, this.selectParent], () => {
      if (this.treeData.length) {
        this._reTreeList();
      }
    }, { deep: true, immediate: true })
  }
}
</script>

<style scoped>
.next-tree-mask {
  position: fixed;
  top: 0rpx;
  right: 0rpx;
  bottom: 0rpx;
  left: 0rpx;
  z-index: 9998;
  background-color: rgba(0, 0, 0, 0.6);
  opacity: 0;
  transition: all 0.3s ease;
  visibility: hidden;
}

.next-tree-mask.show {
  visibility: visible;
  opacity: 1;
}

.next-tree-cnt {
  position: fixed;
  top: 0rpx;
  right: 0rpx;
  bottom: 0rpx;
  left: 0rpx;
  z-index: 9999;
  top: 160rpx;
  transition: all 0.3s ease;
  transform: translateY(100%);
}

.next-tree-cnt.show {
  transform: translateY(0);
}

.next-tree-bar {
  background-color: #fff;
  height: 72rpx;
  padding-left: 20rpx;
  padding-right: 20rpx;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-sizing: border-box;
  border-bottom-width: 1rpx !important;
  border-bottom-style: solid;
  border-bottom-color: #f5f5f5;
  font-size: 32rpx;
  color: #757575;
  line-height: 1;
}

.next-tree-bar-confirm {
  color: #f9ae3d;
}

.next-tree-view {
  position: absolute;
  top: 0rpx;
  right: 0rpx;
  bottom: 0rpx;
  left: 0rpx;
  top: 72rpx;
  background-color: #fff;
  padding-top: 20rpx;
  padding-right: 20rpx;
  padding-bottom: 20rpx;
  padding-left: 20rpx;
}

.next-tree-view-sc {
  height: 100%;
  overflow: hidden;
}

.next-tree-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 26rpx;
  color: #757575;
  line-height: 1;
  height: 0;
  opacity: 0;
  transition: 0.2s;
  position: relative;
  overflow: hidden;
}

.next-tree-item.show {
  height: 80rpx;
  opacity: 1;
}

.next-tree-item.showchild:before {
  transform: rotate(90deg);
}

.next-tree-item.border {
  border-bottom: 1rpx solid rgba(204, 204, 204, 0.2);
}

.next-tree-item.last:before {
  opacity: 0;
}

.next-tree-icon {
  width: 26rpx;
  height: 26rpx;
  margin-right: 8rpx;
}

.next-tree-label {
  flex: 1;
  display: flex;
  align-items: center;
  height: 100%;
  line-height: 1.2;
}

.next-tree-check {
  width: 40px;
  height: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.next-tree-check-yes,
.next-tree-check-no {
  width: 20px;
  height: 20px;
  border-top-left-radius: 20%;
  border-top-right-radius: 20%;
  border-bottom-right-radius: 20%;
  border-bottom-left-radius: 20%;
  border-top-width: 1rpx;
  border-left-width: 1rpx;
  border-bottom-width: 1rpx;
  border-right-width: 1rpx;
  border-style: solid;
  border-color: #f9ae3d;
  display: flex;
  justify-content: center;
  align-items: center;
  box-sizing: border-box;
}

.next-tree-check-yes-b {
  border-top-left-radius: 20%;
  border-top-right-radius: 20%;
  border-bottom-right-radius: 20%;
  border-bottom-left-radius: 20%;
  background-color: #f9ae3d;
  color: #fff;
}

.next-tree-check-yes-b .icon-text {
  font-size: 14px;
  font-weight: normal;
  font-family: uicon-iconfont;
  display: flex;
  flex-direction: row;
  align-items: center;
}

.next-tree-check .radio {
  border-top-left-radius: 50%;
  border-top-right-radius: 50%;
  border-bottom-right-radius: 50%;
  border-bottom-left-radius: 50%;
}

.next-tree-check .radio .next-tree-check-yes-b {
  border-top-left-radius: 50%;
  border-top-right-radius: 50%;
  border-bottom-right-radius: 50%;
  border-bottom-left-radius: 50%;
}

.hover-c {
  opacity: 0.6;
}
</style>